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A Uniform Resource Locator (URL), otherwise known as a Universal Resource Locator, is the address of a resource on the Internet and the protocol used to access it.

It indicates the location of a web resource like a street address indicates where a person lives physically — because of this, an URL is often referred to as: “web address”.

A URL contains the following information:

• The Protocol used to access the resource.
• The location of the server (whether by Internet Protocol Address (IP Address) or Domain Name).
• The Port Number on the Server (optional).
• The location of the resource in the directory structure of the Server.
• A fragment identifier (optional).

A URL is a type of uniform resource identifier (URI). In common practice, the term URI isn't used, or is used synonymously with URL, even though this is technically incorrect.

Source: https://www.techopedia.com/definition/1352/uniform-resource-locator-url